Dishwashing machine, primarily for household use



Paienied'lvln. 27, 1945 DISHWSHING MACHINE, PRIMARILY FOR.YK i

l; i .HOUSEHOLD USE i Jrgen Hertz, CopenhagemDenmark; vested in i `the,Alien PropertyCustodian Application November 22, 193s, serial No.241,833 In Denmark November.26,1937.

' l'Clam. '(Cl. 141-9) This invention. relates-toa dishwashing machine`constructed primarily for. household use and of that. kindwwhich hasone or several liquid discharge openings, nozzles or groups of suchthrough `.which cleansing fluid or rinsing water is dischargedperiodically under tne pressure from a housev water main and through theintervention ofcontrol means, in. 'such a manner rthat the machinecomprises in any case certain -nozzles or nozzle groups which areperiodically brought into action mutually, and .what in :the rst placecharacterizes the invention yis the'feature that the controlmeans which`bringabout the periodical liquid supply-to. the said nozzles or nozzle.

groups are actuated by such means `that the durations of-the periods ofsquirting, which periods need not .beof equalfduration, is regulatedindependently ofwhetherutensils `are inserted in themachineor'not. Thecontrol means employed according ,to the `invention may be driven, forexample, by a driving spring or other separate driving. incanssimilar toa clock or watch, or 4by other driving means,.forrexample a` smallelectromagneticfmotor ldevice-` or, possibly,

a driving device operating with compressed air or water pressureand-constructed, for example.r

in `the `form of a `small turbine. The simplest way is to employ adriving spring ora small water turbinedriven vbyfwater from the house`water main, which Willnot` materially reduce the pressure inthe latter.The nature proper of the control means, or the power A- by which theyare actuated have no bearing upon the main principle of the invention..f

Theinvention makes it possible to determine the directions in which thejetsare to be ejected from the nozzles, consideringsolely theattainmentof the greatest possible mechanical rinsing effect (detachingeffect by jet action). ,-f

Seeing that in any case certain of the machines nozzles are periodicallyin action mutually, the said nozzles are, according to the invention,disposed and adjusted in such a manner that each of them oversquirt withfull mechanical rinsing effect only a portion of the machines chamberholding the utensils, but still in such a manner that the periodicallyactive nozzles do collectively and with full mechanical rinsing effectcommand either the whole of the said chamber or larger portions of thesame, for example a vertical middle section through the chamber,extending only to the chambers middle axis.

It is primarily only the rinsing water which is ejected through nozzlesof which in any case certain are periodically in action mutually, and

if the rinsingwater` nozzles command. they whole of the-machines chamberforxutensilathen. the machine may be constructed with-a fixed carryingframe-for the utensils. If-the rinsing. water nozzles collectivelycommand onlya `cross section through. the machine, or only theone halfof such a section, the machine is constructed with a rotating vcarryingframe for'vthe utensils,

this passingduring. the `rotation through that zone in the machine whichis commanded by the nozzles with full mechanical rinsing effect. The

aforesaid zone need not constitute an` integral surface. 1

Generally, the said mutually periodically active y nozzles will beemployed, .possibly such nozzles iniconjunction with one or moreconstantly active nozzles intended solely for the squirting of theutensils with rinsing water, whereas for the squirting of the utensilswith cleansing :duid constantly active nozzles are primarily employed.There is, however, nothing tonpreventtheemployment of nozzles, all ofwhich or-some of which are periodically active mutually, for theejection of cleansing fluid also. Y

The squirting with cleansing fluid is usually( effected prior to thesquirting with water, and for the' squirting of the` utensils withcleansing fluida special system of nozzles .is used, this dischargingner jets, seeing that the squirting of the utensils with cleansing uidshall serve, in a major-degree, as a kind ofmaceration of the impuritieson the utensils.

As explained, the machine is of the kind, whose nozzles for rinsing;water or cleansing fluid eject r through the pressure from a house watermain.

The cleansingv agent must therefore be introduced at a place in' thepipe or pipes whichconnect ther house watermain with the nozzle ornozzles 1 which .are-intended for the ejection of cleansing4 fluid.vThis is effected in thata supply device for a cleansing agent, forexample soap in solid or fluid form is in a per se known manner insertedin the said pipe or pipes.

Normally, the machine according to the invention is constructed so as tocomprise both cleansing iiuicl nozzles and rinsing water nozzles.

The drawing shows what is needful for the comprehension of theinvention.

In the drawing:

Fig. l is a verticall section through a forni of the dishwashing machineembodying the invention.

Fig. 2 is a section through the control valve for supplying water fromthe house water main to the machine.

The machine has the chamber I with bottom 2 with drain pipe 8. In thechamber I, there are the trays 4 and 8 for carrying dishes or otherarticles to be washed, which are carried by a vertical rotatable shaft 8suitably journaled in the chamber I. Suitably disposed inside of thechamber I is the cylinder l in which is slidably mounted the plunger 8provided on its upper end with a rack 9 extending out of the top of thecylinder 1. This rack 8 meshes with a pinion I on a shaft II suitablyjournaled on the top of the chamber I, and provided with a coil springI2. The shaft II and the shaft 8 are connected by inter-meshing pinionsI3. The cylinder 1. is provided in its lower end I4 with a small bleedopening I5. The valve I6 (shown in detail in Fig. 2) is provided forcontrolling the ow of water from the house main I 1 to the machine. Themain I1 is connected to the plug I8 of valve I6, which controls the flowof water from main will move downwardlyslowly and uniformly. Action ofspring I2 causes shaft I I, through pinions I3 to rotate shaft 8 therebyrotating trays 4- and 5, while the cleansing iluid is sprayed on thearticles carried by trays 4 and 5, since water under pressure now flowsthrough pipe 20. The return of plunger 8 to its lower position, througharm 21, rod 28 and crank 29 adjusts valve I8 to close pipe 2l therebystopping the spraying of the cleansing fluid. Valve I8 is then adjustedso that main I1 is again connected to pipe 20 and the above describedaction, under such circumstances, is repeated. When the plunger 8 hasreached its upper limit of travel. valve I8 is adjusted to connect mainI1 with pipe I8, and to close pipe 2|. Again the plunger 8 is moveddownwardly under action of spring I2. Water under pressure is suppliedby 4pipe I9 and con- I1 to the pipes I8, 20 and 2l. Thepipe I9 has its Aend I9' connected with a conduit 22 in the plunger 8, by a packed joint,the plunger 8 being slidable along the end I9' of lpipe I9. Conduit 22has, at its lower end, an outlet opening 23. A series of pipes 24 areprovided with their ends opening through the side of cylinder 1 in sucha way that the opening 23 successively connects the conduit 22 withpipes 24 as the plunger 8 moves axially of the cylinder 1. These pipes24 are connected respectively with nozzles 24 suitably disposed in thechamber I to spray water on articles carried by the trays 4 and 5. Thepipe 2n passes through a container 25 for any suitable form of cleansingagent, and connects this container 25 with nozzles 28 suitably disposedin the chamber I to spray on the articles carried by the trays 4 and 5 acleansing fluid formed by the water and the cleansing agent. The rack 9is provided with an arm 21 co-operating with a rod 28 to operate a crank29 on plug I8 of valve I6.

The machine operates as follows. When the parts of the machine are inthe positions shown in the figures of the drawing, valve I8 is adjustedto connect the house water main I1 with the pipe 2|. When water underpressure in main duit 22 in plunger 8, through outlet opening 23, to thepipes 24 successively as the downward movement of plunger 8 brings theopening 23 into communication with pipes 24. Through pipes 24 the wateris supplied to nozzles 24' to spray the water on the articles carried bythe trays 4 and 5 which rotate under action of spring I2 while thisspraying occurs. When the plunger 8 reaches its lower position, arm 2 1,rod 28 and crank 29 arijust valve I8 to close pipe I9 and cut on.' thewater from nozzles 24'.

I claim:

In a dishwashing machine for operation in connection with water from adomestic supply main, the combination 0i' a chamber for receiving thedishes to be washed; a rotating frame for supporting the dishes; aseries of nozzles for periodically spraying liquid under pressure of thewater main; a liquid control device controlling the supply of liquid tosaid nozzles, said device being constituted at least in part by twomembers o having relative motion in the axial direction, one

I1 is admitted through pipe 2|, it flows into the lower end I4 ofcylinder 1, thereby forcing -plunger 8 upwardly, This upward movement ofplunger 8 rotates shaft II, through rack 9 and pinion I0, and winds upcoil spring I2 to place it under compression. Valve I8 is then adjustedso that main I1 is connected to pipe 20, and pipe 2I is closed therebyrelieving pressure on plunger 8. The spring I2, having been compressed,re-acts as soon as pressure on -plunger 8 is relieved, and operatingthrough shaft II, pinion I0 and rack 9, forces plunger 8 downwardly, thewater in cylinder 1 below plunger 8 being slowly evacuated through thebleed opening I5, so that plunger 8 of said members having at least oneoutlet opening; means for supplying liquid to said opening, under thepressure of the water supply main, the other member having a pluralityof distributing openings; pipes connecting the distributing openingswith diiierent nozzles, the distributing openings being brought intocommunication with the outlet opening or openings in succession duringrelative movement of said members, whereby for each spraying period onlycertain of said nozzles are rendered operative and substantially thefull force of the pressure in the water supply main is utilized for thenozzle spray; and control means interposed between the liquid controldevice and the rotating frame, said control means including a rack and atoothed wheel-co-operating therewith, said rack moving axially with theliquid control device and said toothed wheel being operatively connectedto the rotating frame.

JQlRGEN HERTZ.

